Halo 3 legandary map pack?

[Nacho Nacho Nacho Man]

i downloaded the halo 3 legandary map pack right and i seen it on my memory right but when i play halo and chose a map on forge and it doesnt come up right and i downloaded it again and still didnt apear right and i also deleted it and downloaded it again but still wont apear any help
i did that it didnt work

 

[sillyshaggy500]

try pulling up the map in custom games first so it loads and the go back into forge... had the same problem and im pretty sure thats what you do.... gotta open them in custom games first